How does KAYAK find such low prices on flights from Ontario to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Ontario to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$132 CHEAP FLIGHTS from Ontario to Seattle

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

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Flight Deals

Cheap Flights from Ontario to Seattle

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Ontario to Seattle

Tue, Sep 9 - Fri, Sep 12

12:00 pm - 7:21 pmYYZ-SEA

10h 21m2 stops

1:15 pm - 12:31 amSEA-YYZ

8h 16m1 stop

$226WestJet

Find Deal

Wed, Sep 17 - Wed, Sep 24

12:00 pm - 8:29 pmYYZ-SEA

11h 29m2 stops

8:40 am - 12:31 amSEA-YYZ

12h 51m2 stops

$227WestJet

Find Deal

Fri, Oct 3 - Fri, Oct 10

8:40 am - 10:59 amYYZ-SEA

5h 19mnonstop

1:15 pm - 12:31 amSEA-YYZ

8h 16m1 stop

$233

Find Deal

Wed, Oct 15 - Mon, Oct 20

4:45 pm - 7:08 pmYYZ-SEA

5h 23mnonstop

2:05 pm - 5:51 amSEA-YYZ

12h 46m2 stops

$238

Find Deal

Tue, Sep 16 - Tue, Sep 23

4:45 pm - 7:08 pmYYZ-SEA

5h 23mnonstop

7:16 am - 3:00 pmSEA-YYZ

4h 44mnonstop

$242Alaska Airlines

Find Deal

Thu, Sep 18 - Wed, Sep 24

1:00 pm - 7:31 pmYYZ-SEA

9h 31m1 stop

2:55 pm - 1:06 amSEA-YYZ

7h 11m1 stop

$245Air Canada

Find Deal

Thu, Sep 18 - Wed, Sep 24

4:45 pm - 7:08 pmYYZ-SEA

5h 23mnonstop

7:16 am - 3:00 pmSEA-YYZ

4h 44mnonstop

$251Alaska Airlines

Find Deal

Fri, Oct 3 - Fri, Oct 10

12:25 pm - 7:31 pmYTZ-SEA

10h 06m1 stop

7:15 am - 7:49 pmSEA-YTZ

9h 34m1 stop

$251Air Canada

Find Deal

Tue, Sep 16 - Tue, Sep 23

9:00 am - 3:52 pmYYZ-SEA

9h 52m2 stops

11:11 am - 11:58 pmSEA-YYZ

9h 47m2 stops

$273United Airlines

Find Deal

Sat, Oct 4 - Tue, Oct 14

9:45 am - 3:45 pmYUL-SEA

9h 00m1 stop

11:40 pm - 10:40 amSEA-YUL

8h 00m1 stop

$400United Airlines

Find Deal

Useful Info

Low season	January
High season	August

Best time to beat the crowds with an average 13% drop in price.

Most popular time to fly with an average 1% increase in price.

How does KAYAK find such low prices on flights from Ontario to Seattle?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Ontario to Seattle?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Lynnwood

Centralia

Fife

Westport

Lacey

Lakewood

Mukilteo

Edmonds

Aberdeen

Woodinville

Poulsbo

Shoreline

DuPont

Monroe

Castle Rock

Edgewood

Everything you need to know for your flight to Seattle

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Seattle

Seattle (SEA)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

$132 Find Cheap Flights from Ontario to Seattle

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

Cheap Flights from Ontario to Seattle

Recent round-trip flight deals from Ontario to Seattle

Recent one-way flight deals from Ontario to Seattle

Recent last minute flight deals from Ontario to Seattle

Recent direct flight deals from Ontario to Seattle

Good to know

FAQs for booking flights from Ontario to Seattle

How does KAYAK find such low prices on flights from Ontario to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Ontario to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Cabin class types available on flights to Ontario

Complete your trip to Seattle with a hotel stay or car rental

Find direct flights for Seattle

Flights to other popular destinations

Flights from domestic origins to Seattle

Choose which airport to fly into in Seattle

Find deals for your return flight